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H. D. LANFAIR. HAGK SAW MACHINE.

N0.466,929. Patented Jan. 12 1892.

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UNITED STATES PATENT OFFICE.

HERBERT D. LANFAIR, OF MILLERS FALLS, MASSACHUSETTS, ASSIGNOR TO THE MILLERS FALLS COMPANY, OF SAME PLACE.

HACK-SAW MACHINE.

SPECIFICATION forming part of Letters Patent No. 466,929, dated January 12, 1892.

Application tiled August 25, 1895i..

T0 @ZZ whom it may conce/7L:

Be it known that I, HERBERT D. LANEAIR, of Millers Falls, in the county of Franklin and State of Massachusetts, have invented a certain new and useful Improvement in Hack- Saw Machines, of which the following, taken in connection with the accompanying drawings, is a specification.

My present invention relates to hack-saw machines for sawing metals, dsc., and the special features and combinations of devices are hereinafter set forth.

In the drawings like letters of reference indicate corresponding parts.

Figure l represents a side elevation of the machine. Fig. 2 represents a plan view.

A is the bed of the machine, supported by legs A A2 or similar means. On one end of bed is a head T, provided with the arm t and gage-nut fr. In the head is carried a crank-v shaft R, journaled therein. On the crankshaft is journaled the movable arm D, which. supports the guide-rods E E. The crank-shaft also has the driving-wheel B, which is loosely journaled thereon, and the hand-lever C, also journaled thereon. The crank-wheel N, with its crank-pin n, is secured to the end ofthe crank-shaft R. The head T has the beveled projecting catch d3 for holding the locking device d, CZ', and d2, attached to arm D, when said arm is raised.

Fitting to and sliding on the guide-rods E E, which rods are held in place by their attachment to arm D and piece E', is the sawframe L, which holds the saw K, secured at each end of frame L by suitable set screws and nuts arranged to hold the hack-saw properly 'in the frame, the latter being indicated by c c c2. A pitman or crank-shaft M, secured to the saw-frame by pin m and to crankpin n, as shown, communicates power to the saw-frame and saw. It will be observed that I place the crank end of the pit-man so that in makingitsrevolutionit will be higher than the end connected with the saw-frame, so that the crank plate or wheel, revolving in the direction of the arrow, will, when it carries the crank-pin and pitinan end upward, and so around, thereby give to the saw a downward stroke during its forward or cutting inoi tion and bringing a pressure on the blade at that point of the work and relievingit on the Serial No. 403,679. (No model.)

return stroke by the revolving of the crankplate. The arm D and guiderods E E are also set so that the frame L is carried backward and forward at an angle, the end toward the pitman being lower. This angle, however, decreases as the sawing progresses and the saw sinks into the metal it is cutting. Th is slant or angle of the arm D and the said guide-rods'also facilitates the cutting.

Upon the bed A is placed the vise for holding the metal to be cut, and preferably consists of the fixed part gand the movable part g', actuated by the screw-threaded rod a, moving in the threaded block a', attached to the bed A. The block of metal to be cut is indicated by Q.

Under the bed is the stop-gage G for measuring the length of metal it is desirable to cut otf. This gage is held by the bolt l, passing through the bed A, in connection with the block and thumb-screw Z; or the gage may be held in any other convenient manner that will permit ot' its adjustability and its being set and held at any desired distance from the bed or metal being cut. It will be seen that one end of the gage runs under the bed, where it is held, as already described, while the other end is bent upward in any convenient shape to rest against the end of the metal to be cut ott. i

On the side of the arm D is placed thelocking device for holding up the frame and arm,

and consists in the bolt cl2, moving in the barrel CZ and actuated by the spring tl. Now

when the arm D is raised the beveled bolt d2 will engage the catch cl3. The ends of catch d3 and bolt cl2 being bot-h beveled, enables the bolt and catch to be either engaged or disengaged by a slight pressure upon the arm D in throwing it up or in throwing it forward. Vhen thrown forward or down, the saw rests upon the metal to be cut, and the weight of the frame, arm, and guide-rods and attachments of course tend to press the saw upon the metal.

The saw-fraineL is provided with suitable studs b b for holding the ends of the sawblade, and is provided with pins h2 b3 and holes for adjusting different lengths of sawblades. By means of the pins the blade can be squared to the work. The thumb-screw c strains up the saw-blade in the frame, andthe set-screws c' c2 may bc used to adj ustl and hold the blade.

Attached to the guiderod E is the sawguide H, adjustably secured to the guide-rod by a set-screw h. On the lower end of the guide-arm H is the slotted end with set-screw h. The saw-blade being held by the slotted end h2 of saw-guide H near the work, prevents the springing or breaking of the saw. The guide is held stationary, and the saw-blade moves back and forth in the slot.

lUnder the movable arm D, which holds the guide-rods E E, is placed the adjustable stop n, attached to the arm t of the head T,and consists of a screw-bolt with a head moving up and down in the arm t. This adjustable stop or gage o is located under the arm D, and by adjusting the stop as desired the distance forward of the arm D will be regulated, and through said arm the depth of the cnt of the saw.

The driving-pulley B is journaled loosely on arbor R, but is made a fast pulley by a clutch operated by the lever C. On the end of arbor or crank-shaft R is placed a collar R, with a clutch or lug q. The driving wheel or pulley B alsohas a corresponding clutch or lug q between the inner end of collar R and the pulley B. Upon the shaft R is placed a spring q2. Said spring continually presses against the pulley B. The head T, which forms bearings for the shaft R, has at the point T adjacent to the hand-lever C one or more recesses, (indicated by D2,) and on the adjacent end of hand-lever C, journaled on shaft R, are formed one or more projections C3. The outer end of the head-bearing Tf, in which the recess or recesses Dzare formed, is beveled, as shown in Fig. 2, so that the projection C3 will easily slide into recess D2 when the hand-lever C is raised.

In operation it will be seen that when the hand-lever C is raised the projection C3 will slide around to the recess D2 and the spring q2 pressing upon the pulley B will press it against the journaled end of hand-lever C, resulting inforcing the projection C3 into recess D2 and releasing the lug q from lug q, and so allowing driving-pulley B to become a loose'pulley upon shaft R.

Vhen it is desired to start the machine, all that is necessary is to throw the lever C forward. recess D2, forcing outward the driving-pulley B, (which is actuated by an ordinary drivingbelt,) and the lugs q q interlock, the spring q2 being compressed, and the crank-shaft is revolved, actuating the pitman and saw-t' rame, as already explained.

Attached to the arm D is a rod D3. The

object of this rod is to strike against the handlever C when the arm D is raised and to carry upward said lever C, thus throwing the lugs q q out of contact, as already explained, and

stopping the machine, the driving-wheel B continuing to be revolved, but as aloosepulley, upon the crankshaft R.

This releases the projection C3 from In case the metal to be cut olf is soft, so that it is undesirable to have the full weight of the arm D and guide-rods and frame attachments resting upon the saw-blade, I have provided a device by which the weight pressing downward upon the blade can be adjusted and regulated with the greatest nicety.

To the arm D is attached an ear d4, which may be integral with the arm-piece. Through this ear is formed an elongated hole or slot p, Fig. 2. (Shown in dotted lines.) Through this hole 19 passes avertical rod p. Said rod has a screwthread at its upper end p3, upon which is screwed the hand-wheel P, with nut part p2, the lower end of the latter resting on the upper side of ear d2. The rod p is preferably extended through the bed A, as shown in Fig. l, (the parts being shown broken away to show the said rod p and its connections.) On the lower end of rod p is placed a nut, or preferably two set-nuts, p4. and around the rod p is a spiral spring o. The upper end ofspring 0 presses against the under side of the bed A. This tension device, as it is called, is operated by simply turning the hand-wheel P. This draws upward the rod p by the screw-thread. p3, the upper end of rod passing up into the nut part p2 of hand-wheel P, and, if necessary, upward through the nut and wheel. This .upward motion of rod p causes a compression of the spring o, and the effect is of course to cause the under side of nut part p2 of Upon the nuts hand-wheel P to press downward upon the A ear cl2, which will balance the weight of arm D and its attachments. By a slight turning of hand-wheel P the pressure of the arm D and attachments upon the saw-blade may be 'increased or diminished. If the Wheel P is turned upward sufficiently to release the pressure upon the ear d2, the saw-blade will receive the full weight of arm D and its attachments. Thus by adjusting the tensionrod p and its connected devices the saw can be made to cut slower or faster, as desired. This feature is particularly valuable upon certain classes of work.

The several parts of the machine are carefully arranged, so that any wear or necessary adjustment of parts may be easily made. For instance, the cross-head part of sawframe, which slides back and forth on the guide-rods, are provided with adjustingscrews ff for taking up any wear or looseness, the parts of the saw-frame being slotted, as shown, thus enabling the screws ff to draw the parts together. The pitman or connecting-rod M isalso slotted at each end m n and provided with screws, as indicated by m, for taking up any looseness. The jaws of vise g g may be made movable asv to one or both jaws, as preferred.

I do not confine myself to the precise form of parts shown and described, as it is evident that modifications maybe made without departing from the spirit of my invention.

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follows: Iower being applied to tlie pulley ll, causing it to revolve on the shaft R in the direction indicated by arrow, the hand-lever C being raised, permitting it to become simply a loose pulley, the metal to be operated on (indicated by Q) is securedin vise between jaws g g by aid of the screw-threaded rod a., and the hack-saw, secured in frame L, is allowed to rest upon the top of the metal bar Q by pressing' the arm D and its attachments forward and downward. Now, by moving the liand-lever C forward and downward, as shown in Fig. l, the driving-pulley B 'will be forced outward horizontally on the shaft R, the spring q2 will be compressed, and the clutches q q will interlock, causing the crankshaft R to revolve with the pulley B, thus actuating the pitinan and the saw-frame and its saw-blade to move back and forth, cutting the metal Q. As the cutting progresses the weight of the arm D and its attachments will continue to press the teeth of the saw-blade upon the metal that is being cut.

The saw-guide I-l, gage G, and, if necessary, the tension device P p and minor parts will be set as hereinbefore described.

The machine can be stopped at any time by raising the hand-lever C, thus releasing the clutches q q', as explained, or,if it is desired to raise the saw-blade, it can be done by raising the arm D until the lock-bolt d2 engages the catch d3, which will hold the arm and saw clear of the work and suspended. lVhen the arm D is thus raised, the rod D8 will strike against the hand-lever C, raising said lever at the same time and stopping the machine.

All the parts are preferably formed of metal.

The position of the shaft R is always pret'- erably higher than the connection of the pitman or connecting-rod M with the saw-frame, thus insuring, as before suggested, a downward pressure of the saw-teeth upon the metal from the beginning of the cutting-stroke to its termination. This is an important point of my invention, although the saw would cut if this arrangement of parts were not provided; but it would be less efficient in use.

Having now fully described my invention, what I claim, and desire to secure by Letters Patent of the United States, is-- l. The hack-saw machine herein described, consisting of the bed A, provided with the head T, the shaft R, driving-wheel B, the arm D, having the guide-rods E E, the saw-carrying frame L, mounted on said guide-rods, the crank-wheel N, fixed to the shaft R, and pitman M, suitably connecting the saw-frame and the cranlrwheel, the vise g g', and gage G, all combined and adapted to operate substantially as and for the purposes set forth.

2. In a hack-saw machine, the shaft R, driving-wheel B, the clutches q q', spring q2, the lever C, provided with the lug or proj ection C3, and the head-bearing T', provided with the depression D2, combined substantially as and for the purposes set forth.

f3. In a hack-saw machine, a pivoted sawframe-carrying arm having an apertured ear d* projecting in rear of its pivot, a screwthreaded rod 1J', adapted to pass through the slotted or apertured ear d* and also the bed of the main frame of the machine, a screwthreaded hand-wheel P, and a suitable spring and means for holdingthe same, all combined and arranged as a tension device, substantially as set forth.

4. In a hack-saw machine, the combination of a saw-supporting arm D, pivoted on the drivin g-shaft, guide-rods secured to said arm, a saw-frame reciprocatively mounted on the guide-rods, a pitman to actuate the frame, and means to yieldingly support said arm, substantially as and for the purposes set forth.

5. In a hack-saw machine, the pivoted sawframe -carrying arm D, provided with the locking-bolt device consisting of the keeper d, bolt d', having a nose cl2, in combination with the catch d3, attached to the head T, substantially as and for the purposes set forth.

6. In a hack-saw machine, the saw-guide H, the yielding guide-rods, to one of which is removably secured said guide, and a reciprocating saw suitably secured in a saw-frame and supported by said guide-rods, all coinbined and adapted to operate substantially as set forth.

7. In a hack-saw machine, a saw-frame arranged to be secured to and move on guide` rods, the said rods yieldingly supported by a pivoted arm supporting said frame, in combination with an adjustable saw-guide removably secured to one or both of said guiderods, substantially as and for the purposes set forth,V

8. In a hack-saw machine, the pivoted sawframe-carrying arm I), the rod D3, secured to said arm, the pivoted lever C, adapted to move on the main dri ving-sliaft R, the clutching device located on said driving-shaft and suitably connected with said lever C, the said arm and rod adapted to raise the said lever, and all combined substantially as and for the purposes set forth.

9. In a hack-saw machine, the pivoted sawframe-carrying arm D, the adjustable screwbolt gage e, attached to the arm t, the arm t, both said arm and said gage located under the said arm D, the head T, to which said arm t is attached, all combined and adapted to operate substantially as and for the purpose set forth.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, on this 7 th day of August, A. D. 1891.

HERBERT D. LANFAIR. lVitnesses:

CHESTER C. CoNANr, CEAS. ALLEN.

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